ARM: s3c24xx: fix mmc gpio lookup tables

The gpio controller names differ between s3c24xx and s3c64xx,
and it seems that these all got the wrong names, using GPx instead
of GPIOx.

Fixes: d2951dfa

 ("mmc: s3cmci: Use the slot GPIO descriptor")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200806182059.2431-3-krzk@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>